LETTERS ON ENTOMOLOGY. 4b) 
pillar. It has pincers on its head, with which it 
soon pierces the under part, which it usually 
attacks, and when once fixed, there is no escape 
for its victim. It commonly devours as many 
as it finds, and generally establishes itself among 
those caterpillars which live in society. They 
are sometimes punished for their gluttony ; for 
when they have eaten so much as to be unable 
to move, the young ones of their own species 
attack and devour them, though without any 
apparent reason, for they will do this when they 
have plenty of caterpillars. 
Butterflies are also infested with parasitical 
insects. A young lady, one day last summer, was 
examining a common brown butterfly (papilio 
jurtina), and saw that on each side the thorax 
were some small bright red spots or tubercles. 
Having touched one of these with a pin, to her 
great surprise it came off, and ran across the 
paper as fast as its little legs could carry it ; and 
on examining the others, she found that their 
heads were buried in the butterfly's body in the 
same manner as a tick fixes itself in the flesh, and 
she had great difficulty in dislodging them. Lin- 
naeus says (speaking of his division of butterflies) 
that et the equites are either Troes or Trojans, 
distinguished by having red or blood-coloured 
spots or patches on each side their breasts ; or 
D 
